code: def function_invocation(self, function_name, *args):
      function_args = ", ".join(args)
      return f"{function_name}({function_args})"
  
file_path: m2cgen/m2cgen/interpreters/elixir/code_generator.py
imports: from contextlib import contextmanager
  from m2cgen.interpreters.code_generator import CodeTemplate, FunctionalCodeGenerator
label_desc: Use image node_id 5 for calling the ElixirCodeGenerator obj's underlying member method code with example usage: obj.function_invocation(function_name) and returns: function_name, str, function_args, str